<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>
    <!-- 卡片视图区 -->
    <el-card>
      <!-- 警告区 -->
      <el-alert title="注意：只允许第三级分类设置相关参数！"
                type="warning"
                :closable="false"
                show-icon>
      </el-alert>
      <!-- 选择商品分类区 -->
      <el-row class="cat_opt">
        <span>选择商品分类：</span>
        <!-- 商品分类的级联选择框 -->
        <el-cascader v-model="selectedCateKeys"
                     :options="catelist"
                     :props="cateProps"
                     @change="handleChange"
                     clearable></el-cascader>

      </el-row>
      <!-- tab页签区域 -->
      <el-tabs v-model="activeName"
               @tab-click="handleTabClick">
        <el-tab-pane label="动态参数"
                     name="many">
          <!-- 第一tab -->
          <el-button type="primary"
                     size="mini"
                     :disabled="isBtnDisabled"
                     @click="addDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData"
                    border
                    striple>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template v-slot="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals"
                        :key="i"
                        closable
                        @close="handleClose(i,scope.row)">{{item}}</el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag"
                          v-if="scope.row.inputVisible"
                          v-model="scope.row.inputValue"
                          ref="saveTagInput"
                          size="small"
                          @keyup.enter.native="handleInputConfirm(scope.row)"
                          @blur="handleInputConfirm(scope.row)">
                </el-input>
                <!-- 添加按钮 -->
                <el-button v-else
                           class="button-new-tag"
                           size="small"
                           @click="showInput(scope.row)">+ New Tag</el-button>

              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <!-- 参数名称列 -->
            <el-table-column label="参数名称"
                             prop="attr_name"></el-table-column>
            <!-- 操作 -->
            <el-table-column label="操作">
              <!-- 作用于插槽 -->
              <template v-slot="scope">
                <el-button type="primary"
                           icon="el-icon-edit"
                           size="mini"
                           @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger"
                           icon="el-icon-delete"
                           size="mini"
                           @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <el-tab-pane label="静态属性"
                     name="only">
          <!-- 第二tab -->
          <el-button type="primary"
                     size="mini"
                     :disabled="isBtnDisabled"
                     @click="addDialogVisible = true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData"
                    border
                    stripe>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <!-- 参数名称列 -->
            <el-table-column label="属性名称"
                             prop="attr_name"></el-table-column>
            <!-- 操作 -->
            <el-table-column label="操作">
              <!-- 作用于插槽 -->
              <template v-slot="scope">
                <el-button type="primary"
                           icon="el-icon-edit"
                           size="mini"
                           @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger"
                           icon="el-icon-delete"
                           size="mini"
                           @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>
    <!--修改参数对话框 -->
    <el-dialog :title="'修改'+titleText"
               :visible.sync="editDialogVisible"
               width="50%"
               @close="editDialogClosed">
      <!-- 内容主体开始 -->
      <el-form :model="editForm"
               :rules="editFormRules"
               ref="editFormRef"
               label-width="100px">
        <el-form-item :label="titleText"
                      prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>

        </el-form-item>

      </el-form>
      <!-- 内容主体结束 -->
      <span slot="footer"
            class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary"
                   @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
    <!-- 添加参数或属性对话框 -->
    <el-dialog :title="'添加'+titleText"
               :visible.sync="addDialogVisible"
               width="50%"
               @close="addDialogClosed">
      <!-- 内容主体开始 -->
      <el-form :model="addForm"
               :rules="addFormRules"
               ref="addFormRef"
               label-width="100px">
        <el-form-item :label="titleText"
                      prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>

        </el-form-item>

      </el-form>
      <!-- 内容主体结束 -->
      <span slot="footer"
            class="dialog-footer">
        <el-button @click="addDialogVisible = false">取 消</el-button>
        <el-button type="primary"
                   @click="addParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data () {
    return {
      // 商品分类数据
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children',
        expandTrigger: 'hover'
      },
      // 级联选择框双向绑定的数据
      selectedCateKeys: [],
      // 被激活的页签名称
      activeName: 'many',
      // 动态参数数据
      manyTableData: [],
      // 静态属性数据
      onlyTableData: [],
      // 控制添加对话框的显示与影藏
      addDialogVisible: false,
      // 添加参数表单数据对象
      addForm: {
        attr_name: ''
      },
      // 添加表单验证规则对象
      addFormRules: {
        attr_name: [{
          required: true, message: '请输入参数名称', trigger: 'blur'
        }]
      },
      // 控制修改对话框的显示和影藏
      editDialogVisible: false,
      // 修改的表单数据对象
      editForm: { attr_name: '' },
      // 修改的表单验证规则对象
      editFormRules: {
        attr_name: [{
          required: true, message: '请输入参数名称', trigger: 'blur'
        }]
      }
    }
  },
  created () {
    this.getCateList()
  },
  computed: {
    // 如果按钮需要被禁用
    isBtnDisabled () {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    // 当前三级分类id
    cateId () {
      if (this.selectedCateKeys.length === 3) { return this.selectedCateKeys[2] }
      return null
    },
    // 动态计算对话框属性文本
    titleText () {
      if (this.activeName === 'many') return '动态参数'
      return '静态属性'
    }

  },
  methods: {
    // 获取所有的商品分类列表
    async getCateList () {
      const { data: res } = await this.$http.get('/categories')
      if (res.meta.status !== 200) return this.$message.error('获取商品分类数据失败!')
      this.catelist = res.data
      // this.$message.success('获取商品数据成功!')
      console.log(this.catelist)
    },
    // 级联选择框选中项变化，会触发这个函数
    handleChange () {
      // console.log(this.selectedCateKeys)
      // 获取参数数据
      this.getParamData()
    },
    // tab页签处理函数
    handleTabClick () {
      // console.log(this.activeName)
      // 获取参数数据
      this.getParamData()
    },
    // 获取参数的列表数据
    async getParamData () {
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        return
      }
      // 证明是三级分类
      // console.log(this.selectedCateKeys)
      // 根据所选分类的id和当前所处的面板获取对应的参数
      const { data: res } = await this.$http.get(`/categories/${this.cateId}/attributes`, { params: { sel: this.activeName } })
      if (res.meta.status !== 200) return this.$message.error('获取参数列表失败！')
      // this.$message.success('获取参数列表成功！')
      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(',') : []
        item.inputVisible = false
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    // 监听对话框关闭事件
    addDialogClosed () {
      this.$refs.addFormRef.resetFields()
    },
    // 点击按钮添加参数
    addParams () {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`/categories/${this.cateId}/attributes`, { attr_name: this.addForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 201) return this.$message.error('添加参数失败！')
        this.$message.success('添加参数成功！')
        this.addDialogVisible = false
        this.getParamData()
      })
    },
    // 点击按钮展示修改对话框
    async showEditDialog (attrId) {
      const { data: res } = await this.$http.get(`/categories/${this.cateId}/attributes/${attrId}`, { attr_sel: this.activeName })
      if (res.meta.status !== 200) return this.$message.error('获取参数失败！')
      this.editForm = res.data
      this.editDialogVisible = true
    },
    // 关闭对话框触发事件
    editDialogClosed () { this.$refs.editFormRef.resetFields() },
    // 点击按钮修改参数信息
    editParams () {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`/categories/${this.cateId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) return this.$message.error('修改参数失败！')
        this.$message.success('修改数据成功!')
        this.getParamData()
        this.editDialogVisible = false
      })
    },
    // 点击删除按钮触发删除事件
    async removeParams (attrId) {
      const confirmResult = await this.$confirm('此操作将永久删除该文件, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 取消了删除操作
      if (confirmResult !== 'confirm') return this.$message.info('已取消删除')
      // 删除业务逻辑
      const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attrId}`)
      if (res.meta.status !== 200) return this.$message.error('删除参数失败！')
      this.$message.success('删除参数成功！')
      this.getParamData()
    },
    // 文本框按enter或离开
    handleInputConfirm (row) {
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
      }
      // 有输入的内容
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      this.saveAttrVals(row)
    },
    // 点击newTag标签
    showInput (row) {
      row.inputVisible = true
      // 让文本框自动获得焦点
      // nextick函数是页面重新渲染后，才会执行里面的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    // 将attr_vals的操作保存到数据库
    async saveAttrVals (row) {
      // 发起请求保存数据
      const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, { attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join('') })
      if (res.meta.status !== 200) return this.$message.error('修改参数失败！')
      this.$message.success('修改参数成功！')
    },
    // 删除对应的参数可选项
    handleClose (i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  }
}
</script>

<style lang="less" scoped>
.cat_opt {
  margin: 15px 0;
}
.el-tag {
  margin: 10px;
}
.input-new-tag {
  width: 120px;
}
</style>
